The two lines`ax+by=cand a'x+b'y=c'` are perpendicular if

The two lines ax+by=c and a'x+b'y=c' are perpendicular if

The two lines ax+by+c=0 and a'x+b'y+c'=0 are perpendicular if (i) ab'=a'b (ii) ab+a'b'=0 (iii) ab'+a'b=0 (iv) a a'+b b'=0

Lines ax+by =c and a'x + b'y=c' are mutually perpendicular then .......... of the following is valid.

If planes ax+by+cz+d=0 and a'x+b'y+c'z+d'=0 are perpendicular, then

If the quadrilateral formed by the lines ax + by + c = 0, a'x + b'y + c' = 0, ax + by + c' = 0,a'x + b'y + c = 0 have perpendicular diagonals, then :

If the quadrilateral formed by the lines ax+by+cz=0, ax+b'y+c=0, a'x+by+c'=0, a'x+b'y+c'=0 have perpendicular diagonals, then :

Find the condition that the one of the lines given by ax^2+2hxy+by^2=0 may be perpendicular to one of the lines given by a'x^2+2h'xy+b'y^2=0